package com.lingxu.base.common.util;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import cn.afterturn.easypoi.excel.entity.params.ExcelExportEntity;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

/**
 * @Title: EasyExcelUtils
 * @Package: com.stu.excel.excel.util
 * @Author: ysj闫世杰
 * @Email: 1105324813@qq.com
 * @Date: Created in 2020/12/26 10:48
 * @Description: Excel导入、导出工具类
 * @Version: 1.0.0
 */
public class EasyExcelUtils {

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,
                                   boolean isCreateHeader, HttpServletResponse response) {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);
    }

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,
                                   HttpServletResponse response) {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
    }

    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        defaultExport(list, fileName, response);
    }

    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response,
                                      ExportParams exportParams) {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        if (workbook != null)
            ;
        downLoadExcel(fileName, response, workbook);
    }

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
        try (OutputStream out = response.getOutputStream()){
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            workbook.write(baos);
            response.setHeader("Content-Length", String.valueOf(baos.size()));
            out.write( baos.toByteArray());
        } catch (IOException e) {
            // throw new NormalException(e.getMessage());
        }
    }

    public static  <T> void writeExcelToStream(String fileName, List<ExcelExportEntity> entity, List<T> dtoLst) {
        try {
            File file = new File(fileName);
            FileOutputStream out = new FileOutputStream(file);
            // easyPoi操作excel
            Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(), entity, dtoLst);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            workbook.write(baos);
            out.write(baos.toByteArray());
            out.close();
        } catch (Exception e) {
           e.printStackTrace();
        }
    }

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null)
            ;
        downLoadExcel(fileName, response, workbook);
    }

    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            // throw new NormalException("模板不能为空");
        } catch (Exception e) {
            e.printStackTrace();
            // throw new NormalException(e.getMessage());
        }
        return list;
    }

    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows,
                                          Class<T> pojoClass) {
        if (file == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        } catch (NoSuchElementException e) {
            // throw new NormalException("excel文件不能为空");
        } catch (Exception e) {
            // throw new NormalException(e.getMessage());
            System.out.println(e.getMessage());
        }
        return list;
    }

    public static <T> List<T> importExcel(InputStream fin, Integer titleRows, Integer headerRows,
                                          Class<T> pojoClass) {
//        if (file == null) {
//            return null;
//        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(fin, pojoClass, params);
        } catch (NoSuchElementException e) {
            // throw new NormalException("excel文件不能为空");
        } catch (Exception e) {
            // throw new NormalException(e.getMessage());
            System.out.println(e.getMessage());
        }
        return list;
    }

    public static void exportExcel(String filepath,List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,
                                   HttpServletResponse response) {
        defaultExport(filepath,list, pojoClass, fileName, response, new ExportParams(title, sheetName));
    }
    private static void defaultExport(String filepath,List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response,
                                      ExportParams exportParams) {
        isChartPathExist(filepath);
        String targetPath = filepath+File.separator+fileName;
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        if (workbook != null)
            ;
        FileOutputStream fos = null;
        try {
            fos=new FileOutputStream(targetPath);
            workbook.write(fos);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                if(workbook!=null){
                    workbook.close();
                }
                if(fos!=null){
                    fos.close();
                }

            } catch (IOException e) {
                e.printStackTrace();
            }

        }
//        downLoadExcel(fileName, response, workbook);
    }
    /**
     * 判断文件夹是否存在，如果不存在则新建
     *
     * @param dirPath 文件夹路径
     */
    public static void isChartPathExist(String dirPath) {
        File file = new File(dirPath);
        if (!file.exists()) {
            file.mkdirs();
        }
    }
}